Comment 462 for bug 1690085

(In reply to OptionalRealName from comment #375)
> Thread still ongoing with no response from AMD.
>
> Really shouldn't need to fiddle with custom bios options.
>
> What is big business / big iron or whatever it's called doing with Epyc and
> linux servers? Are those totally fine?

I am running an Epyc-based server, and as posted in this thread here:
https://forums.fedoraforum.org/showthread.php?317537-first-server-error-reboot-what-is-this-UUID
(worth a full read)
everything in there was solved by setting the correct Virtualization flags in BIOS, as specified by a Supermicro Tech as follows:
========
It looks like you want to enable the virtualization feature.
Please go into BIOS,
Advanced -> NB Configuration -> IOMMU (change to Enabled).
Advanced -> PCIe/PCI/PnP Configuration -> SR-IOV Support (change to Enabled).
========

After this, the server worked without a hitch, and I have now upgraded it from Centos7, to Fedora 28, and it runs like a charm.

Of course the server is not IDLE at all, and maybe that saves the server from the low power issue discussed in this thread. However, I have had it at least 7 days just sitting there not doing anything, and it never had any problem.